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#!/bin/bash
 
#
# Script that checks if given sites are up and sends an e-mail if the are not.
# You should not run this script on the same servers your monitoring,
# neither should your e-mail account reside on a server behind same firewall as the sites your checking.
#
# Developer: oSource Development
# DevTeam: Marcus Uddenhed
# Version: 0.6.1
# Web: http://www.osource.se
# Updated: 2017-10-30
#
# Requires: heirloom-mailx (http://heirloom.sourceforge.net/mailx.html)
#
# Licensed under BSDL license, see license information on our homepage.
#
 
#### Global variables ####
# Sites
checkSite[1]="http://" # Add sites that you want to monitor, can be as many as you want.
checkSite[2]="https://"
 
# Retries
rInterval=8 # How many times should it retry until it set the site as down.
rTime=20 # How many seconds shold it wait between retries.
 
# Mail
sendMail=yes # Should i send an e-mail with failed sites.
mailFrom="" # From whom shall this mail be sent?
mailTo="" # To whom shall the mail be sent?
smtpHost="" # The SMTP mail server that is going to process the mail.
smtpAuth=yes # Does the SMTP mail server require authentication(yes/no).
smtpUser="" # Username if smtpAuth is set to yes.
smtpPass="" # password if smtpAuth is set to yes.
smtpPort=587 # Standard for non authenticated SMTP is 25, 587 is for authenticated SMTP.
mailBin="heirloom-mailx" # executable file for mailx.
 
# Logging
logStatus=yes # Should we log to local logfile(yes/no).
logPath="/var/log" # Where should we put the log file(omit the traling slash).
logName="oSiteChecker.log" # name of log file.
 
#### Do not edit anything below unless you know what you are doing. ####
 
check_sites() {
# Declare $is variable
is=0
 
# Start control
for i in "${checkSite[@]}"
do
CURL=$(curl -s --head $i)
if echo $CURL | grep "200 OK" > /dev/null
then
# add entry to log file if logging enabled
if [ $logStatus == "yes" ]
then
echo `date +%F` `date +%T` "$i" "Host up" >> $logPath/$logName
else
# if logging set to no send to null
echo "" > /dev/null
fi
else
# Collect all sites that do not respond as they should for further processing.
siteArray[ $is ]="${i}"
(( is++ ))
fi
done
 
# Check to see if any sites been reported as down.
if [ ${#siteArray[@]} -ne 0 ]
then
# Test each failed site in a given amount of times.
for ((n=1;n<=$rInterval;n++))
do
# Go through failed sites again to eliminate temporary glicthes.
for i in "${siteArray[@]}"
do
CURL=$(curl -s --head $i)
if echo $CURL | grep "200 OK" > /dev/null
then
# remove succesful sites from array.
delete=(${i})
siteArray=( "${siteArray[@]/$delete}" )
else
# Keeps failed site in array.
echo "" > /dev/null
fi
done
 
# Clean empty lines in siteArray
tmpArray=()
for value in "${siteArray[@]}"
do
[[ $value != "" ]] && tmpArray+=($value)
done
siteArray=("${tmpArray[@]}")
unset tmpArray
 
# Debug
#for i in "${siteArray[@]}"
#do
# echo ${i}
#done
 
# Sleeps for an amount of time between checking site status again.
sleep $rTime
done
fi
 
# notification action
if [ ${#siteArray[@]} -ne 0 ]
then
#echo ${#siteArray[@]}
# Send an email with status
if [ $sendMail == "yes" ]
then
# Temp path for mailbody.txt
tmpPath=/tmp
 
# Set mail subject
mailSubject="Connectivity test failed"
 
# Build mail body
echo "Hi" > $tmpPath/mailbody.txt
echo "" >> $tmpPath/mailbody.txt
echo "One or more servers is not responding as the should, see complete list below." >> $tmpPath/mailbody.txt
echo "" >> $tmpPath/mailbody.txt
for i in "${siteArray[@]}"
do
echo ${i} >> $tmpPath/mailbody.txt
done
#echo "Test - Array size:" ${#siteArray[@]} >> $tmpPath/mailbody.txt
echo "" >> $tmpPath/mailbody.txt
echo "Sent:" `date +%Y-%m-%d` `date +%H:%M` >> $tmpPath/mailbody.txt
echo "" >> $tmpPath/mailbody.txt
echo "Regards" >> $tmpPath/mailbody.txt
echo "" >> $tmpPath/mailbody.txt
echo "Your $(cat /etc/hostname) server." >> $tmpPath/mailbody.txt
 
# Send data
MAILRC=/dev/null $mailBin -n
if [ $smtpAuth = "no" ]
then
env MAILRC=/dev/null from=$mailFrom smtp=$smtpHost:$smtpPort $mailBin -v -n -s "$mailSubject" $mailTo <$tmpPath/mailbody.txt
fi
if [ $smtpAuth = "yes" ]
then
env MAILRC=/dev/null from=$mailFrom smtp=$smtpHost:$smtpPort smtp-auth-user=$smtpUser smtp-auth-password=$smtpPass smtp-use-starttls=yes ssl-verify=ignore smtp-auth=login $mailBin -n -s "$mailSubject" $mailTo <$tmpPath/mailbody.txt
fi
 
# Remove temporary mailbody.txt file
rm $tmpPath/mailbody.txt
else
echo "" > /dev/null
fi
 
# add entry to log file if logging enabled
if [ $logStatus == "yes" ]
then
for i in "${siteArray[@]}"
do
echo `date +%F` `date +%T` ${i} "Host down" >> $logPath/$logName
done
fi
fi
}
 
mail_test() {
# Temp path for mailbody.txt
tmpPath=/tmp
 
# Set mail subject
mailSubject="Mail test"
 
# Build mail body
echo "Hi" > $tmpPath/mailbody.txt
echo "" >> $tmpPath/mailbody.txt
echo "This is a test mail to see that the mail function works." >> $tmpPath/mailbody.txt
echo "" >> $tmpPath/mailbody.txt
echo "Sent:" `date +%Y-%m-%d` `date +%H:%M` >> $tmpPath/mailbody.txt
echo "" >> $tmpPath/mailbody.txt
echo "Regards" >> $tmpPath/mailbody.txt
echo "" >> $tmpPath/mailbody.txt
echo "Your $(cat /etc/hostname) server." >> $tmpPath/mailbody.txt
 
# Send data
MAILRC=/dev/null $mailBin -n
if [ $smtpAuth = "no" ]
then
env MAILRC=/dev/null from=$mailFrom smtp=$smtpHost:$smtpPort $mailBin -v -n -s "$mailSubject" $mailTo <$tmpPath/mailbody.txt
fi
if [ $smtpAuth = "yes" ]
then
env MAILRC=/dev/null from=$mailFrom smtp=$smtpHost:$smtpPort smtp-auth-user=$smtpUser smtp-auth-password=$smtpPass smtp-use-starttls=yes ssl-verify=ignore smtp-auth=login $mailBin -n -s "$mailSubject" $mailTo <$tmpPath/mailbody.txt
fi
 
# Remove temporary mailbody.txt file
rm $tmpPath/mailbody.txt
}
 
script_help() {
echo "Usage: oSiteChecker.sh <parameter>"
echo ""
echo "Parameters:"
echo "--check Does a test connection to pre-configured sites and test to see if they are responding."
echo "--mail-test Does a test on the mail function to see if all mail related settings are okay."
}
 
case $1 in
--check)
check_sites
;;
--mail-test)
mail_test
;;
*)
script_help
;;
esac
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